TimelinePanel: REGRESSIONS: three fixes for TimelineOverviewPane.

1) Selected window doesn't slide while recording. Why: there used to be a call for _updateWindow from _update method.
2) No overview for Events mode. Why: raw records may have no valid endTime.
3) The window selection is dropping by recording timeline. Why: earlier overview pane saved the selected time range at _onWindowChanged.

BUG=
R=pfeldman@chromium.org

Review URL: https://codereview.chromium.org/185543012

git-svn-id: svn://svn.chromium.org/blink/trunk@168367 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/devtools/front_end/TimelineModel.js

@@ -364,7 +364,7 @@ WebInspector.TimelineModel.prototype = {
 
         if (this._minimumRecordTime === -1 || startTime < this._minimumRecordTime)
             this._minimumRecordTime = startTime;
-        if (this._maximumRecordTime === -1 || endTime > this._maximumRecordTime)
+        if ((this._maximumRecordTime === -1 && endTime) || endTime > this._maximumRecordTime)
             this._maximumRecordTime = endTime;
     },
 

third_party/WebKit/Source/devtools/front_end/TimelineOverviewPane.js

@@ -97,6 +97,7 @@ WebInspector.TimelineOverviewPane.prototype = {
             this._overviewControl.update();
         this._overviewGrid.updateDividers(this._overviewCalculator);
         this._updateEventDividers();
+        this._updateWindow();
     },
 
     _updateEventDividers: function()
@@ -152,6 +153,8 @@ WebInspector.TimelineOverviewPane.prototype = {
         if (this._muteOnWindowChanged)
             return;
         var windowTimes = this._overviewControl.windowTimes(this._overviewGrid.windowLeft(), this._overviewGrid.windowRight());
+        this._windowStartTime = windowTimes.startTime;
+        this._windowEndTime = windowTimes.endTime;
         this.dispatchEventToListeners(WebInspector.TimelineOverviewPane.Events.WindowChanged, windowTimes);
     },
 
@@ -165,13 +168,17 @@ WebInspector.TimelineOverviewPane.prototype = {
             return;
         this._windowStartTime = startTime;
         this._windowEndTime = endTime;
-        var windowBoundaries = this._overviewControl.windowBoundaries(startTime, endTime);
+        this._updateWindow();
+        this.dispatchEventToListeners(WebInspector.TimelineOverviewPane.Events.WindowChanged, { startTime: startTime, endTime: endTime });
+    },
+
+    _updateWindow: function()
+    {
+        var windowBoundaries = this._overviewControl.windowBoundaries(this._windowStartTime, this._windowEndTime);
         this._muteOnWindowChanged = true;
         this._overviewGrid.setWindow(windowBoundaries.left, windowBoundaries.right);
         this._overviewGrid.setResizeEnabled(!!this._model.records().length);
         this._muteOnWindowChanged = false;
-
-        this.dispatchEventToListeners(WebInspector.TimelineOverviewPane.Events.WindowChanged, { startTime: startTime, endTime: endTime });
     },
 
     _scheduleRefresh: function()